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106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
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/***************************************************************************\
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*
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* MPEG Layer3-Audio Decoder
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* <EFBFBD> 1997-2006 by Fraunhofer IIS
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* All Rights Reserved
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*
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* filename: mpegheader.h
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* project : MPEG Decoder
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* author : Martin Sieler
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* date : 1997-12-05
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* contents/description: ISO/MPEG Header
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*
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*
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\***************************************************************************/
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/*
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* $Date: 2010/11/17 20:46:04 $
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* $Id: mpegheader.h,v 1.1 2010/11/17 20:46:04 audiodsp Exp $
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*/
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#ifndef __MPEGHEADER_H__
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#define __MPEGHEADER_H__
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/* ------------------------ includes --------------------------------------*/
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/*-------------------------- defines --------------------------------------*/
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class CBitStream;
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/*-------------------------------------------------------------------------*/
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//
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// MPEG header class.
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//
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// This object reads and decodes an ISO/MPEG header.
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//
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class CMpegHeader
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{
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public:
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CMpegHeader();
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virtual ~CMpegHeader();
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int ReadFrom(CBitStream &sBS);
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int FromInt(unsigned long dwHdrBits);
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int GetMpegVersion() const { return m_MpegVersion;}
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int GetLayer() const { return m_Layer;}
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int GetChannels() const { return m_Channels;}
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int GetSampleRate() const { return m_SampleRate;}
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int GetSampleRateNdx() const { return m_SampleRateNdx;}
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int GetBitrate() const { return m_Bitrate;}
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int GetBitrateNdx() const { return m_BitrateNdx;}
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int GetMode() const { return m_Mode;}
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int GetModeExt() const { return m_ModeExt;}
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int GetPadding() const { return m_Padding; }
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int GetCrcCheck() const { return m_CrcCheck;}
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int GetCopyright() const { return m_Copyright;}
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int GetOriginal() const { return m_Original;}
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int GetEmphasis() const { return m_Emphasis;}
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int GetHeaderLen() const
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{ return MPEG_HDRLEN+(m_CrcCheck?MPEG_CRCLEN:0); }
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int GetFrameLen() const { return m_FrameLen;}
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float GetDuration() const { return m_Duration;}
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int GetSamplesPerFrame() const;
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protected:
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private:
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enum { MPEG_HDRLEN = 32, MPEG_CRCLEN = 16 };
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int CalcFrameLen();
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void ResetMembers();
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void SetMembers();
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// header fields
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int m_Syncword;
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int m_Idex;
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int m_Id;
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int m_Layer;
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int m_CrcCheck;
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int m_BitrateNdx;
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int m_SampleRateNdx;
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int m_Padding;
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int m_Private;
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int m_Mode;
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int m_ModeExt;
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int m_Copyright;
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int m_Original;
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int m_Emphasis;
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// calculated data
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int m_HeaderValid;
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int m_MpegVersion;
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int m_Channels;
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int m_SampleRate;
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int m_Bitrate;
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int m_FrameLen;
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float m_Duration;
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};
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/*-------------------------------------------------------------------------*/
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#endif
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